Extension-index and folder.



W. A. OVERBEOK.

EXTENSION INDEX AND FOLDER.

APPLICATION FILED 0OT,8, 1912.

Patented J an. 6, 1914.

WITNESSES ATTORNEYS COLUMBIA PLANOGRAPH CQ-IW'ASHINGTON, n C.

UNITED STATES PATENT OFFICE.

WILLIAM A. OVERBIECK, OF SALT LAKE CITY, UTAH.

EXTENSION-INDEX AND FOLDER.

To all whom it may concern:

Be it known that I, WILLIAM A. OVER- BECK, a citizen of the UnitedStates, and a resident of Salt Lake City, in the county of Salt Lake andState of Utah, have invented a new and Improved Extension-Index andFolder, of which the following is a full, clear, and exact description.

This invention relates to improvements in folders or extension indexfiles, and has for an object to provide an improved folding backstructure which will hold the front and greater number of letters orother matter to be filed.

In carrying out the objects of the invention, backs or front and backleaves are pro vided of any desired construction and in which aresecured pairs of pivotally mounted links. These links are pivotallyconnected together and also pivotally connected to fastening meansconnected with the front and back covers so that as additional matter isplaced between the front and back covers the connecting links willgradually move for permitting this extension of the folder.

A practical embodiment of the invention is represented in theaccompanying draw ings forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure 1 is a perspective view of an embodiment of the invention shownpartially expanded; Fig. 2 is a rear edge view of the structure shown inFig 1, the same being shown partially closed or collapsed in dottedlines; Fig. 3 is a section through Fig. 2 approximately on line 3-3,certain parts being broken away; Fig. 1 is a detail eleva tion of onecorner of the folder, certain parts being shown in section for betterillustrating the construction; Fig. 5 is a section through Fig. 4 on theline 5-5; Fig. 6 is an elevation of a slightly modified form of clamp orsecuring means for the pivotally mounted links forming certain featuresof the in- Specification of Letters Patent.

Application filed October 8, 1912.

Patented Jan. 6, 1914.

Serial No. 724,550.

v ention, the same being shown in connection with part of one of thecovers; and Fig. 7 is a section through Fig. 6 on the line Referring tothe accompanying drawings by numerals, 1 and 2 indicate the covers of anindex or folder which is adapted to receive letters or other matter tobe filed. These covers are connected by pivotally mounted links 3 and 1pivotally connected together at 5 and pivotally connected at 6 and 7 toextensions 8 and 9 projecting through clamps 10 and 11. The clamps 10and 11 are formed from a strip of metal substantially U-shape in crosssection, as shown more in detail in Fig. 5/ The inner edges 12 of theseU-shaped clamps 10 and 11 are pressed tightly against the respectivebacks, while the outer edges are also pressed tightly against the backsbut are provided with spurs 13 which project through the respectivebacks and are bent over as clearly shown in Figs. 4 and 5. By providingsubstantially U-shaped clamps 10 and 11 the covers 1 and 2 arereinforced to an appreciable extent in order that the same may not betorn even though made from comparatively soft paper.

If desired, clamps 10 and 11 could be eliminated and a slightly modifiedform of clamp 14 (Figs. 6 and 7) could be used. This clamp is formedwith an extension 15 to which the respective hinges are pivoted and witha body portion 16 and a plurality of spurs 17 designed to extend fromthe body 16 through the walls of the covers and then be bent over orclamped down tight against the covers. This form of clamp is sometimesdesirable and operates successfully where the covers are not fragile orweak.

In a device embodying the invention a simple and strong expansiblefolder or cover index device is provided which may be easily insertedand removed in a vertical filing cabinet without in any way disturbingthe other matter in the cabinet. It will also be evident that letters orother matter in the index or folder may be varied in amount without inany way disturbing any of the other folders in the same drawer of thecabinet. If desired, an index slide 18 could be provided on one of thecovers for receiving index cards whereby the entire index or foldercould be inserted and removed from a filing cabinet as a single articleor a single letter.

Having thus described my invention I claim as new and desire to secureby Letters Patent 1. In a device of the character described, a pair ofcovers, a pair of stifi'ening clamps engaging the rear edge of saidcovers formed With overlapping bracing members and a plurality ofextensions, a link pivotally connected to each of said extensions, andmeans for pivotally connecting said links together in pairs whereby thebacks of said covers are expansibly connected together.

2. In a device of the character described, a pair of covers, a pair ofstiffening clamps engaging the rear edge of said covers formed withoverlapping bracing members, a plurality of extensions, and a pluralityof spur cleats extending through said covers and bent over or clenchedon the opposite side,

a link pivotally connected to each of said extensions, and means forconnecting the said links together in pairs whereby the backs of saidcovers are expansibly connected together.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WILLIAM A. OVERBEGK.

IVitnesseS S. A. MAGINNIs, A. J. WEBER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

